1-26 A farmer must decide what combination of seed, G water, fertilizer, and pest control will be most prof- itable and environmentally conscious for the coming year. The local agricultural college did a study of this farmer's situation and prepared the following table. Direct Extra-market Plan Cost/Acre Cost/Acre Income/Acre A $750 $150 $1200 B 800 450 1400 1000 250 1500 D 1300 200 1650 The last page of the college's study was torn off, and hence the farmer is not sure which plan the agricultural college recommends. Which plan should the farmer adopt considering: (a) only the direct costs, (b) both the direct and extra-market costs